VACUUM DIAGRAMS

Following are vacuum diagrams for most of the engine and emissions package combinations covered by this guide. Because vacuum circuits will vary based on various engine and vehicle options, always refer first to the vehicle emission control information label, if present. Should the label be missing, or should the vehicle be equipped with a different engine than the vehicle's original equipment, refer to the diagrams below for the same or similar configuration.

Fig. Fig. 1: The Vehicle Emission Control Information (VECI) label, located in the engine compartment, contains important emissions information

If you wish to obtain a replacement emissions label, most manufacturers make the labels available for purchase. The labels can usually be ordered from a local dealer.